Merge with commit eab948c7387dd08e53574dca41f59630b4c14c7c

When node accepts transaction or receives block, it tries to load all
inputs to mempool. Trying to load zero-inputs to mempool leads to
corruption - valid transaction may be removed from mempool during
conflicts check. To prevent this, inputs selection algorithms modified
to ignore zero-inputs. Conflicts check ignores them too.

Transaction fee is validated before accepting transaction to mempool

Input with pointer to change output conflicts with consensus rules as
there is no underlying transaction with funds for that input. Consensus
modified to ignore that input in funds checks.

- NBitcoin
	- move folder JsonConverters
	- remove Protobuf
	- move RPC
- NBitcoin.Tests
- Stratis.Bitcoin.Features.Notification
- Stratis.Bitcoin.Features.Notifications.Tests
- Stratis.Bitcoin.Features.Dns
- Stratis.Bitcoin.Features.Dns.Tests
- Stratis.Bitcoin.Features.BlockStore
	- added BlockStoreQueue.cs
	- remove BlockPair.cs
	- remove BlockStoreLoop.cs
	- remove BlockStoreLoopStep.cs
	- remove BlockStoreLoopStats.cs
	- remove \LoopSteps\BlockStoreInnerStepContext.cs
	- remove \LoopSteps\BlockStoreInnerStepFindBlocks.cs
	- remove \LoopSteps\BlockStoreInnerStepReadBlocks.cs
	- remove \LoopSteps\CheckNextChainedBlockExistStep.cs
	- remove \LoopSteps\DownloadBlockStep.cs
	- remove \LoopSteps\ProcessPendingStorageStep.cs
	- remove \LoopSteps\ReorganiseBlockRepositoryStep.cs
- Stratis.Bitcoin.Features.Consensus
	- added RuleContextOverrides.cs
	- added CoinviewRule.cs
	- added PosCoinviewRule.cs
	- added PowCoinviewRule.cs
	- remove Checkpoints.cs
	- remove ConsensusManager.cs
	- remove ConsensusPerformanceCounter.cs
	- remove ConsensusSettings.cs
	- remove ContextualInformation.cs
	- remove IPosConsensusValidator.cs
	- remove IPowConsensusValidator.cs
	- remove PosConsensusValidator.cs
	- remove IConsensusRules.cs
	- remove PowConsensusValidator.cs
- Stratis.Bitcoin.Features.Api
- Stratis.Bitcoin.Api.Tests
- Stratis.Bitcoin.Features.LightWallet
- Stratis.Bitcoin.Features.MemoryPool
- Stratis.Bitcoin.Features.Miner
- Stratis.Bitcoin.Features.RPC
- Stratis.Bitcoin.Features.Wallet
- Stratis.Bitcoin.Features.WatchOnlyWallet

- Stratis.Bitcoin
- Stratis.Bitcoin.Cli
- Stratis.BitcoinD
- Stratis.BreezeD
- Stratis.StratisD
- Stratis.StratisDnsD